figureslibres.cc/user/themes/figureslibres/scss/theme/_blog.scss

#item_list{
    display: inline-flex;
    flex-wrap: wrap;
    width: 100%;
  .card{
    width: $Wi50;
    height: 100%;
    &:nth-child(odd){
      margin-right: $margI;
    }
    .card-header{
      z-index: 999;
      display: inline-flex;
      width: 100%;
      & > * {
        margin-right: $marg;
      }
    }
  }
}